JPH10147984A - Structure of connection section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective structure for a connection section by connecting the end section of a beam steel frame to a steel pipe by welding, forming a haunch section at the end section of the beam steel frame, and connecting the end section of a beam main reinforcement to the haunch section. SOLUTION: Concrete 4 is filled in a steel pipe 3 to construct a column 1. Beam main reinforcements 6 are arranged on and beneath a beam steel frame 5 made of an H-steel, and a haunch section 5A is formed at the end section to form a beam 2. Only the tip of the haunch section 5A of the beam steel frame 5 is directly welded to the outer periphery of the steel pipe 3 in the beam 2. Since the beam main reinforcements 6 are connected to the haunch section 5A at the end section of the beam steel frame 5, the stress borne by the beam main reinforcements 6 is naturally transferred to the beam steel frame 5, and the rigidity and yield strength as the beam 2 made of steel encased reinforced concrete can be secured without hindrance even when the beam main reinforcement 6 is not fixed to the column 1 as usual. The rigidity and yield strength can be sufficiently increased as compared with the case that the beam 2 is made of a steel frame, and the fire-resistant cover of the beam 2 can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a connection part which is a joint part between a column and a beam, and is particularly suitable for a case where a column mainly composed of a steel pipe is joined to a steel reinforced concrete beam. Related to the structure of the connection part.

[0002]

2. Description of the Related Art As is well known, there is a structure called a filled steel pipe concrete structure as a pillar structure of a building. This is a kind of steel structure made mainly of steel pipe and filled with concrete inside.However, not only is the steel pipe and concrete inside it able to provide sufficient strength, but also to steel reinforced concrete columns. It is advantageous in terms of cost and workability in comparison, and has the advantage that a fireproof coating is not required if predetermined conditions are satisfied.For example, it can be used for high-rise or super-high-rise apartment buildings. In recent years, it has been widely adopted as a structure.

[0003] When such a filled steel tube concrete column is adopted, the beam is made of a steel frame (S
Conventionally). In that case, the joint between the filled steel pipe concrete column and the steel frame beam is the same as in the case of the entire steel frame, directly connecting the steel pipe of the column and the steel frame of the beam, or via a bracket, It can be easily performed by welding or bolting.

[0004]

As described above, it is possible to omit the refractory coating for the column made of concrete filled with steel pipe, but the refractory coating is indispensable for the steel beam, and the omission is omitted. In order to further increase the rigidity of the beam, a steel frame reinforced concrete structure (S
(RC construction).

[0005] However, when the beam is made of steel reinforced concrete, how to join the steel reinforced concrete beam and the filled steel pipe concrete column, that is, what kind of structure of the connection portion is to be determined. Is an important issue to consider. In other words, when the beam is made of steel reinforced concrete, the steel part of the beam can be sufficiently firmly and easily joined to the steel pipe of the column by welding, etc., but the concrete part of the beam is connected to the steel pipe of the column. It is not always easy to join firmly and firmly, and therefore, there is a concern that stress transmission between the beams joined to the columns may not be sufficient. To date, no effective connection structure has been developed for connecting filled steel pipe concrete columns and steel reinforced concrete beams, and effective improvement measures have been requested. It had been.

[0006] As a usual method for joining a steel-framed reinforced concrete beam to a steel pipe column, an end of a beam main reinforcing bar is inserted into the steel pipe and fixed to the inside of the steel pipe. It is conceivable to connect the main bars. However, in that case, it is necessary to provide a large number of holes for penetrating the beam main reinforcement in the steel pipe, so reinforcement for the steel pipe is required, and it is not easy to connect the beam main reinforcement in the steel pipe, In addition, it is necessary to avoid interference between the beam main reinforcements of beams in directions perpendicular to each other in the steel pipe, so it is also necessary to take measures such as shifting the position of the beam main reinforcement vertically by making a difference in the beam formation dimensions of those beams. After all, such a structure is unrealistic because the connection part becomes unnecessarily complicated and the construction must be complicated.

[0007] The above is not limited to the case where the column is made of a filled steel pipe concrete structure, but also to a column of another structure constructed mainly of a steel pipe, for example, a simple structure in which the steel pipe itself is used as a column without filling concrete. In addition to filling concrete in steel pipe columns and steel pipes, the outside of the steel pipe is covered with concrete. This is a common problem when a steel reinforced concrete beam is joined to a column made of steel reinforced concrete.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an effective structure of a connection portion when a column mainly composed of a steel pipe is joined to a steel reinforced concrete beam. Is to do.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a joint, which is a joint between a column formed mainly of a steel pipe and a steel reinforced concrete beam in which beam main reinforcing bars are arranged above and below a beam steel frame. A structure in which an end of the beam steel is welded to the steel pipe and joined, and a haunch portion is formed at an end of the beam steel, and an end of the beam main reinforcing bar is joined to the haunch. It is characterized by becoming. It is preferable that a diaphragm is provided in the steel pipe at a position where the beam steel frame is joined.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. This embodiment is applied to a joint between a column 1 made of filled steel tube concrete and a beam 2 made of steel-framed reinforced concrete, and FIG. 1 is a perspective view schematically showing the structure of a connection portion, and FIG. 3A and 3B are cross-sectional views of the beam 2, wherein FIG. 3A is a view taken along the line IIIa-IIIa in FIG. 2, and FIG. 3B is a view taken along the line IIIb-IIIb in FIG.

The pillar 1 in the present embodiment is constructed by filling a concrete 4 into the entire inside of a steel pipe 3 having a square cross section. Moreover, the beam 2 in this embodiment arranges the beam main reinforcing bar 6 above and below the beam steel frame 5 which consists of H-section steel, respectively,
Wrap a stirrup 7 (see FIG. 3A) around the outside,
Furthermore, the beam steel frame 5 is formed by casting concrete 8 on the entire surface.
A is formed. That is, the beam steel frame 5
Is the height dimension and the upper and lower flanges 5
The widths of a and 5b are larger than the middle part, and the ends of the upper and lower beam main reinforcements 6 are welded to the upper and lower upper flanges 5a and 5b in the haunch portion 5A while keeping the upper and lower beam main reinforcements 6 straight. Are joined together. Reference numeral 9 in FIG. 3 denotes a two-step streak arranged as necessary, and may be omitted if unnecessary (the two-step streak 9 is omitted in FIGS. 1 and 2). ).

In the beam 2 in which the end of the beam main bar 6 is joined to the haunch portion 5A of the beam steel 5 as described above, only the end of the beam steel 5 (that is, the tip of the haunch portion 5A) is a steel pipe. 3
The steel pipe 3 is welded directly to the outer peripheral surface of the steel pipe.
The inside of the steel pipe 3 is provided with a diaphragm 1 at the joint position of the upper and lower flanges 5a, 5b of the beam steel frame 5.
0 is provided in advance.

According to the above structure, since the beam main reinforcing bar 6 is joined to the haunch portion 5A at the end of the beam steel frame 5, the stress borne by the beam main reinforcing bar 6 is naturally transmitted to the beam steel frame 5, and therefore, the normal beam Thus, the rigidity and proof strength of the steel-framed reinforced concrete beam 2 can be secured without hindrance even if the main beam 6 is not fixed to the column 1. Therefore,
By adopting the connection part of the above structure, only the end of the beam steel 5 is joined to the steel pipe 3 and the steel reinforced concrete beam 2 is joined to the filled steel pipe concrete column 1 without any trouble. As a result, the rigidity can be sufficiently increased as compared with the case where the beam 2 is made of steel, and the fireproof coating of the beam 2 can be omitted. It is very effective when applied to high-rise apartment buildings.

The cross-sectional shape of the steel pipe 3 is not limited to a square, but may be a polygonal cross section or a circle. The diaphragm 10 provided on the steel pipe may be an outer diaphragm or a through diaphragm instead of the inner diaphragm as described above. It is good.

In the above description, the ends of the main beam 6 are directly welded to the upper and lower flanges 5a and 5b. Instead, an appropriate coupler is welded to the flanges 5a and 5b. Alternatively, the beam main reinforcement 6 may be joined to the haunch portion 5A by, for example, screwing the beam main reinforcement 6 into the coupler. In addition, the haunch portion 5A at the end of the beam steel frame 5 is welded to the steel pipe 3 as a bracket in advance, and the middle portion of the beam steel frame 5 is welded to the haunch portion 5A or bolted through a gusset plate. It is also possible to form the beam 2 by joining.

Further, the above embodiment is applied to the column 1 made of concrete filled with steel pipe. However, a simple steel pipe column not filled with concrete, a column made of concrete filled with steel pipe, and a column made of concrete filled with steel pipe are used. The same can be applied to the case. In short, the present invention can be generally applied to a case in which a steel reinforced concrete beam 2 is joined to a column constructed mainly of a steel pipe 3.

[0017]

As described above, according to the present invention, a haunch portion is provided at an end of a beam steel frame, and the end of a beam main bar is joined to the haunch portion. Is transmitted to the beam steel frame, so that the rigidity and strength of the steel reinforced concrete beam can be secured without fixing the beam main bar to the column as usual. Therefore, according to the present invention, it is possible to join a steel-framed reinforced concrete beam to a column mainly composed of a steel pipe with a very simple structure by only joining a steel beam to a steel pipe. As a result, as a result, the rigidity and proof strength can be sufficiently increased compared to the case where the beam is made of steel,
The fire-resistant coating on the beams can also be omitted, and is therefore very useful, for example, for high-rise or high-rise apartment buildings.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a structure of a connection part of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a sectional view of the same beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 Steel pipe 4 Concrete 5 Beam steel 5A Haunch part 5a, 5b Flange 6 Beam main bar 8 Concrete 10 Diaphragm

Claims (2)

[Claims] 1. A structure of a joint part which is a joint between a column formed mainly of a steel pipe and a steel reinforced concrete beam in which beam main reinforcing bars are arranged above and below a beam steel frame, wherein the beam steel frame is provided. Is welded to the steel pipe and joined, and a haunch portion is formed at the end of the beam steel frame, and the end of the beam main bar is joined to the haunch portion. Structure of connection part. 2. The structure of a connection part according to claim 1, wherein a diaphragm is provided in the steel pipe at a position where the beam steel frame is joined.